Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
  • B23Q5/22—Feeding members carrying tools or work
  • B23Q5/26—Fluid-pressure drives
  • B23Q5/261—Fluid-pressure drives for spindles
  • B23Q5/263—Fluid-pressure drives for spindles with means to control the feed rate by controlling the fluid flow
  • B23Q5/265—Fluid-pressure drives for spindles with means to control the feed rate by controlling the fluid flow this regulation depending upon the position of the tools or work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
  • B23Q16/003—Equipment for precise positioning of tool or work into particular locations not otherwise provided for with means to return a tool back, after its withdrawal movement, to the previous working position
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T408/00—Cutting by use of rotating axially moving tool
  • Y10T408/23—Cutting by use of rotating axially moving tool including means to cause Tool to progressively vibrate toward work
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T408/00—Cutting by use of rotating axially moving tool
  • Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
  • Y10T408/564—Movable relative to Tool along tool-axis
  • Y10T408/5647—Movable relative to Tool along tool-axis including means to move Tool
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T408/00—Cutting by use of rotating axially moving tool
  • Y10T408/65—Means to drive tool
  • Y10T408/675—Means to drive tool including means to move Tool along tool-axis
  • Y10T408/6757—Fluid means

Definitions

• the present invention relates to airfeed drills; more particularly, the present invention relates to airfeed peck drills.
• Airfeed peck drills have found their greatest utilization
• airfeed peck drills have the ability to drill accurate holes with a fine surface finish.
• airfeed peck drills were best used when drilling deep holes in thick material (depth to diameter ratios or 7:1 or greater).
• Patent 4,123,188 The extended length of the airfeed peck drill taught in the '188 patent embodies what was thought to be the necessary technology to make an airfeed peck drill operate. Specifically, it was thought that the drill quill containing the air
• I S motor and reduction gearing must be moved by an air cylinder attached to the back end of the drill quill.
• a follower arm was mounted to the back of the cylinder. The follower arm was used to engage a damping cylinder. This damping cylinder then controlled the feed rate of the drill quill towards the
• T5 with the weight of the unit would then cause improperly drilled holes, particularly in smaller or thinner workpieces, due to fixture deflection.
• a shortened airfeed peck drill includes a motor and reduction gearing in a drill quill which is contained within a 25 cylindrical housing.
• the distal end of the drill quill includes a piston so that the drill quill may be reciprocated within the housing.
• a reaction bracket is attached to the front end of the drill quill.
• Following rearward and external to the housing is a motion transfer arm.
• the motion transfer arm is connected to the reaction bracket.
• an engagement arm for contact with the damping cylinder which controls the rate of entry of the drill into the workpiece.
• the airfeed peck drill of the present invention may include a device which mechanically fixes the position of the piston rod which extends from the damping cylinder at the end of each feed cycle and means to control the duration or time of each peck cycle.
• Figure 1 is a perspective view of an airfeed peck drill
• Figure 2 is a rear elevational view of the airfeed peck drill shown in Figure 1;
• Figure 3 is a perspective view partially in phantom showing internal components
• FIG 4 is a perspective view partially cut away of a section of the airfeed peck drill shown in Figures 1 and 3.
• airfeed peck drill 100 consists of several parts. On the front of the airfeed peck drill is a nose piece 12.
• a drill bushing 14 is attached to nose piece 12 to mount airfeed peck drill 100 to a fixture (not shown). The fixture is attached to a workpiece.
• Travelling through nose piece 12 is ro.tary drill 16 and chuck 18. 5
• Rotary drill 16 and chuck 18 are driven rotaiably by an air motor and gear arrangement (not shown) which are enclosed within drill quill 20.
• Drill quill 20 fits within a cylinder formed in housing 22. Heretofore it was thought necessary to avoid any contact with front cantilevered portion of drill quill 20. It was felt that contact 0 with the front of drill quill 20 would lead to problems such as inaccuracy and surface roughness on the inside of the hole being drilled. Specifically, forces exerted near the front of drill quill 20 were thought to deflect drill quill 20. The continued insertion and extraction of the rotating drill from the hole exaggerated any 5 deflection of the drill quill resulting in a lack of accuracy in the drilled hole. Therefore, it was deemed necessary to avoid any forces on the front of the drill quill to avoid any deflection of the drill as it entered the hole.
• reaction bracket 24 which is attached to the front end of drill quill 20.
• the attachment of reaction bracket 24 to the front end of drill quill 20 will not cause the drill bit 16 to waiver or be deflected as it enters or exits the hole being drilled as the drill bit is supported by drill bushing 14.
• drill ⁇ uill 20 may be offset with rasoect to oistor, 38 without causing drill quill 20 to waiver or deflect. This offset allows for the placement of a motor air feed tube 44 above quill 20 and within the retract side of the cylinder within housing 22. Feed tube 44 is rigidly attached to offset thrust piston 38 so that air may be fed to the motor within drill quill 20 while drill quill 20 reciprocates.
• -Feed tube 44 also assures proper orientation of piston 38.
• Opposite feed tube 44 is back set adjusting screw 54.
• Screw 54 is positioned so that it will limit the range of travel of quill assembly 20.
• the adjustment of a screw 54 allows for exclusion of any segment of the return stroke of drill quill 20. Accordingly, the retracted position of quill assembly 20 may be adjusted for various drill 16 lengths maintaining rotation from the time quill 20 advance begins until it is fully retracted. This is accomplished because screw 54 interacts with the valve (not shown) which supplies air to the drive motor. When the rotating drill is moved toward the workpiece, screw 54 is out of contact with the valve which supplies air to the motor. The motor operates because this valve is of a normally open configuration.
• a further advantage of the adjustment of screw 54 is that the end of the drill bit 16 may be positioned even with the end of drill bushing 14 or at any other desired location irrespective of the length of drill 16 or chuck 18. This eliminates unnecessary drill travel time.
• motion transfer arm 26 Attached to reaction bracket 24 and running parallel to housing 22 is motion transfer arm 26. Motion transfer arm 26 moves both forward and backward as reaction bracket 24 follows the position of drill quill 20.
• Engagement arm 28 Attached to the end of motion transfer arm 26 is engagement arm 28. Engagement arm 28 extends away from motion transfer arm 26 and contacts piston rod 30 which extends from damping cylinder 32.
• pistol grip handle 38 may be attached to housing 22 for additional ease in handling and using drill 100.
• Compressed air may be supplied to the tool at one of two locations. Specifically, compressed air may be supplied through air inlet 40 located on the side of the drill 100 as shown in Figure 2 or through air inlet 42 which is located on the rear of drill 100. The flow of compressed air passes through passageways in housing 22 and through feed tube 44
• airfeed peck drill 100 is mounted to a fixture by bushing 14 or any other suitable means, activation switch 34 is pushed and the peck drilling cycles begin.
• Rotating drill 16 is moved into the workpiece.
• the time of contact of rotating drill 16 with the workpiece is controlled by air logic means (not shown) contained on the side of the airfeed peck drill.
• air logic means are well known in the art and have been typically used on a variety of air tools and pneumatic power equipment.
• damping cylinder 32 which is mounted on the top of airfeed peck drill 100. Extending rearward from damping cylinder 32 is piston rod 30 which exerts a continuing counter force on engagement arm 28.
• Damping cylinder 32 houses a piston (not shown). This piston is constructed so that a controlled flow of hydraulic fluid is allowed around the piston.
• a knob 36 on the front allows the counterforce applied by the piston to be adjusted. This changes the drill feed rate. Specifically, a very low counterforce increases the feed rate of airfeed peck drill 100 so that drill 100 will move farther into the workpiece before the timing circuit takes over and causes the drill to back out of the hole.
• a larger counter force will cause airfeed peck drill 100 to move a lesser distance into the workpiece before the timing circuit takes over and causes the airfeed drill to move out of the workpiece.
• engagement arm 28 moves away from the end of piston rod 30 which extends from damping cylinder 32. That is the air supplied to piston 38 at the end of housing 22 causes drill quill 20 to retract until adjustment screw 58 stops against valve (not shown). The air logic circuit then causes the air to be applied to the rear of piston 38 and drill quill 20 returns toward the workpiece in a rapid return fashion.
• Setback control 46 restricts the amount of return of control rod 30 and consequently allows rotating drill 16 to rapid advance to within a predetermined distance from the bottom of the hole.
• stop 48 which moves threaded rod 50 forward.
• a valve (not shown) which signals completion of the drill operation.
• stop 52 Also located on threaded rod 50 is stop 52 which provides a positive stop for accurate depth control .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Drilling And Boring (AREA)
• Fluid-Damping Devices (AREA)
• Earth Drilling (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=22358463

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (2)

Citations (4)

Family Cites Families (58)

• 1988
  • 1988-10-14 WO PCT/US1988/003599 patent/WO1989004228A2/en active IP Right Grant
  • 1988-10-14 DE DE89901818T patent/DE3886390T2/de not_active Expired - Fee Related
  • 1988-10-14 JP JP1501767A patent/JP2721720B2/ja not_active Expired - Lifetime
  • 1988-10-14 EP EP89901818A patent/EP0345344B1/en not_active Expired - Lifetime
  • 1988-10-26 GR GR880100731A patent/GR1000538B/el unknown
• 1993
  • 1993-11-09 US US08/150,547 patent/US5374143A/en not_active Expired - Fee Related

Patent Citations (4)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events